基于H形缝隙耦合的宽带圆极化微带天线

Broadband Circularly Polarized H-Shaped Aperture-Coupled Microstrip Patch Antenna

制作并测量了一种基于H形缝隙耦合的宽带圆极化微带天线,并讨论了天线的各结构参数对天线性能的影响。测量结果表明:通过Wilkinson功分器馈电,可使天线驻波带宽达47.5%,轴比带宽达50%,方向图前后比达-21dB,实现了低后瓣宽带圆极化微带天线的设计。

Design of broadband circularly polarized microstrip patch antenna which is coupled by two H-shaped apertures is presented in this paper. Based upon the proximity coupling feed by the Wilkinson power divider, the proposed antenna can have a standing wave bandwidth of about 47.5% and the axial-ratio value within 3dB is about 50%. The front-to-back ratio of the antenna radiation pattern is better than -21dB, which indicate the realization of the good circularly polarized and low backward radiation level characteristics.